EP0478675B2 - A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor - Google Patents

A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor Download PDF

Info

Publication number: EP0478675B2
Authority: EP; European Patent Office
Prior art keywords: pump; pressure; pressure difference; hydraulic; flow
Prior art date: 1989-06-21
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.): Expired - Lifetime

Application number

EP90910156A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0478675B1 (en

EP0478675A1 (en

Inventor

Sture Lindblom

Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Volvo Wheel Loaders AB

Original Assignee

Volvo Wheel Loaders AB

Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)

1989-06-21

Filing date

1990-06-19

Publication date

1999-02-03

Family has litigation

First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=20376356&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0478675(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.

1990-06-19 Application filed by Volvo Wheel Loaders AB filed Critical Volvo Wheel Loaders AB

1990-06-19 Priority to AT90910156T priority Critical patent/ATE97999T1/de

1992-04-08 Publication of EP0478675A1 publication Critical patent/EP0478675A1/en

1993-12-01 Publication of EP0478675B1 publication Critical patent/EP0478675B1/en

1999-02-03 Application granted granted Critical

1999-02-03 Publication of EP0478675B2 publication Critical patent/EP0478675B2/en

2010-06-19 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

Classifications

- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery

Definitions

the present invention relates to a loading machine which is equipped with two pumps which function to supply hydraulic oil to at least one hydraulically operated working component, such as a hydraulic piston-cylinder device or a hydraulic motor having variable oil-pressure and oil-flow requirements, wherein the pumps can be connected one with the other for mutual coaction, when necessary.
a hydraulically operated working component such as a hydraulic piston-cylinder device or a hydraulic motor having variable oil-pressure and oil-flow requirements
Some loading machines of this kind are equipped with two fixed displacement pumps instead of one large pump of fixed displacement.
Fixed displacement pumps result in relatively large throttle losses and consequently a single variable displacement pump is used in some instances.
a large variable displacement pump is required, however, the cost entailed is considerable and much higher than that entailed by two fixed displacement pumps intended for the same purpose.
one of said pumps is able to produce a high hydraulic pressure and a small hydraulic flow, whereas the other pump is able to produce a lower hydraulic pressure and a larger hydraulic flow.
the first pump is activated when a high fluid pressure and a relatively small fluid flow is required, and the second pump is isolated from the system, by coupling said pump to the tank.
the second pump is also coupled to the system when a smaller hydraulic pressure but greater flow is required.
Such requirements occur, for instance, in the case of relatively large loading machines equipped with lifting jibs and a bucket or shovel, e.g. machines intended for loading gravel removed from a gravel pit.
inventive regulator device constructed in accordance with the invention and having the features set forth in the following single Claim.
inventive device is constructed to sense a region of low flow and a region of high flow, and at the border between these regions to connect-up both pumps in the system when there is a need for greater flow, so that the two pumps together will achieve the desired greater flow of hydraulic medium in the upper flow region.
Figure 1 illustrates a preferred embodiment comprising a variable displacement pump and a fixed displacement pump.
FIG 2 is a more detailed illustration of the variable displacement pump used in the Figure 1 embodiment and the load-sensing pump regulator.
Figure 3 is a detailed illustration of double-acting piston-cylinder device connected in the system.
the reference numeral 10 identifies a variable displacement pump of, e.g., a known piston type, and the reference numeral 12 identifies a fixed displacement pump.
the pump 10 is preferably much smaller than the pump 12.
the pumps are driven by the engine 14 of the loading machine.
the pump 10 is provided with a load-sensing pump regulator 16 of known design, as illustrated schematically in Figure 2.
the pump conduit 18 of the pump 10 is connected to a hydraulically operated hydraulic component, such as a hydraulic piston-cylinder device 24, by means of a smoothly adjustable throttle-valve 20 and a working conduit 22.
the working conduit 22 is connected by means of a conduit 22a to the pump regulator 16, which is set to a constant pressure difference PdP.
Lying over the throttle valve is a pressure difference dP which is normally equal to PdP, the pump pressure P being equal to the pressure difference dP + the load pressure PL.
this signal is utilized, in a simple manner, to activate the larger pump 12.
the pump 12 is normally connected to the tank 26 via a smoothly adjustable control valve 28 when said valve is in its open position.
the other side of the valve is connected to a working conduit 22B in which the pressure PL prevails, and is also influenced on said one side by a spring F which produces a force which is slightly smaller than the force exerted by pressure dP.
the other side of the valve is influenced by the pump pressure P in the conduit 18, via the conduit 18a, 18b, i.e. PL + dP.
the force PL + the spring force F will adjust the valve to its illustrated closed position.
the pump 12 will then supply pressure oil through its pump conduit 30 and a check valve 32 to the pump conduit 18 so as to increase the flow through the throttle valve 20 to the hydraulic piston-cylinder device 24, therewith satisfying the higher flow demand of said device.
the regulating device is a particularly simple device for achieving the desired result.

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Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
General Engineering & Computer Science (AREA)
Fluid-Pressure Circuits (AREA)
Operation Control Of Excavators (AREA)

EP90910156A 1989-06-21 1990-06-19 A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor Expired - Lifetime EP0478675B2 (en)

Priority Applications (1)

Application Number	Priority Date	Filing Date	Title
AT90910156T ATE97999T1 (de)	1989-06-21	1990-06-19	Belademaschine mit einer ersten und einer zweiten pumpe, um druckoel zu foerdern nach mindestens einer durch fluessigkeit angetriebenen komponente, wie eine hydraulische kolbenzylindereinrichtung oder hydraulischer motor.

Applications Claiming Priority (3)

Application Number	Priority Date	Filing Date	Title
SE8902253A SE466560B (sv)	1989-06-21	1989-06-21	Lastmaskin med en foersta och en andra pump foer matning av tryckolja till minst en hydrauliskt driven arbetskomponent saasom enhydraulcylinder eller hydraulmotor
SE8902253		1989-06-21
PCT/SE1990/000435 WO1990015931A1 (en)	1989-06-21	1990-06-19	A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor

Publications (3)

Publication Number	Publication Date
EP0478675A1 EP0478675A1 (en)	1992-04-08
EP0478675B1 EP0478675B1 (en)	1993-12-01
EP0478675B2 true EP0478675B2 (en)	1999-02-03

Family

ID=20376356

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP90910156A Expired - Lifetime EP0478675B2 (en)	1989-06-21	1990-06-19	A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor

Country Status (8)

Country	Link
US (1)	US5165862A (sv)
EP (1)	EP0478675B2 (sv)
JP (1)	JP2634321B2 (sv)
DD (1)	DD297942A5 (sv)
DE (1)	DE69004961T3 (sv)
ES (1)	ES2046787T5 (sv)
SE (1)	SE466560B (sv)
WO (1)	WO1990015931A1 (sv)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102012011953A1 (de) *	2012-06-18	2013-12-19	Christian Böhner	Vorrichtung zur Erzeugung unterschiedlicher Arbeitsdrücke

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5228289A (en) *	1983-06-29	1993-07-20	Peter Norton	Plural hydraulic pump system with unloading valve
US5513732A (en) *	1994-08-05	1996-05-07	Ford Motor Company	Regulation of hydraulic pressure in a system having multiple pressure sources
DE19502235A1 (de) *	1995-01-25	1996-08-08	Daimler Benz Ag	Ölversorgungssystem
US6374606B1 (en)	1999-03-19	2002-04-23	Caterpillar S.A.R.L.	Dual pump ejector system for articulated trucks and the like having horizontal discharge
US6293765B1 (en) *	2000-05-08	2001-09-25	Sauer-Danfoss Inc.	Tandem fixed displacement pump with torque control
US7384183B2 (en) *	2002-09-06	2008-06-10	Global Ground Support, Llc	Mobile decontamination unit
DE102005013458A1 (de) *	2004-04-20	2005-11-10	ACCULUBE Manufacturing GmbH - Schmiermittel und -geräte -	Vorrichtung und Verfahren zur Bereitstellung eines feinen Ölnebels
US8128377B2 (en) *	2007-04-03	2012-03-06	GM Global Technology Operations LLC	Split-pressure dual pump hydraulic fluid supply system for a multi-speed transmission and method
US20090025380A1 (en)	2007-07-24	2009-01-29	Parker Hannifin Corporation, An Ohio Corporation	Fixed/variable hybrid system
US8506267B2 (en)	2007-09-10	2013-08-13	Schlumberger Technology Corporation	Pump assembly
EP2055942B1 (en) *	2007-11-01	2012-06-06	Sauer-Danfoss ApS	Hydraulic system with supplement pump
EP2055953B1 (en) *	2007-11-01	2018-08-15	Danfoss Power Solutions Aps	Fluid working machine
DE102007062030A1 (de) *	2007-12-21	2009-06-25	Robert Bosch Gmbh	Hydraulikfluidpumpe einer Fahrzeugbremsanlage mit einem Fördermittel
US20090191068A1 (en) *	2008-01-29	2009-07-30	Clark Equipment Company	Variable volume reservoir
DE102009003306A1 (de) *	2009-01-05	2010-07-08	Bühler Druckguss AG	Hydraulisches Antriebsaggregat
US8801407B2 (en) *	2010-02-24	2014-08-12	Harris Waste Management Group, Inc.	Hybrid electro-hydraulic power device
US20110225962A1 (en) *	2010-03-22	2011-09-22	Spx Corporation	Variable Speed Hydraulic Pump Apparatus and Method
CN104192709B (zh) *	2014-09-22	2017-05-03	徐州重型机械有限公司	一种起重机及其多路阀液压系统
CA3206994A1 (en)	2016-09-02	2018-03-08	Halliburton Energy Services, Inc.	Hybrid drive systems for well stimulation operations
NO342938B1 (en) *	2016-10-06	2018-09-03	Qinterra Tech As	Downhole tractor comprising two or more hydraulic supply lines
US11441551B2 (en)	2017-04-28	2022-09-13	Graco Minnesota Inc.	Portable hydraulic power unit
US12196195B2 (en) *	2020-06-12	2025-01-14	Deere & Company	Demand based hydraulic pump control system

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3526468A (en) *	1968-11-13	1970-09-01	Deere & Co	Multiple pump power on demand hydraulic system
US3947194A (en) *	1972-02-22	1976-03-30	Putzmeister Interholding Gmbh.	Apparatus for damping the pressure increase of hydrostatic drives
US3985472A (en) *	1975-04-23	1976-10-12	International Harvester Company	Combined fixed and variable displacement pump system
US4382485A (en) *	1980-05-27	1983-05-10	Dresser Industries, Inc.	Hydraulic logic control for variable displacement pump
JPS6158683A (ja) *	1984-08-22	1986-03-25	サヴイオ　エ　チ．ソチエタ　ペル　アチオ−ニ	パンテイストツキング製造装置

1989
- 1989-06-21 SE SE8902253A patent/SE466560B/sv not_active IP Right Cessation
1990
- 1990-06-19 EP EP90910156A patent/EP0478675B2/en not_active Expired - Lifetime
- 1990-06-19 JP JP2509288A patent/JP2634321B2/ja not_active Expired - Fee Related
- 1990-06-19 DD DD90341816A patent/DD297942A5/de not_active IP Right Cessation
- 1990-06-19 DE DE69004961T patent/DE69004961T3/de not_active Expired - Fee Related
- 1990-06-19 WO PCT/SE1990/000435 patent/WO1990015931A1/en active IP Right Grant
- 1990-06-19 US US07/778,944 patent/US5165862A/en not_active Expired - Lifetime
- 1990-06-19 ES ES90910156T patent/ES2046787T5/es not_active Expired - Lifetime

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE102012011953A1 (de) *	2012-06-18	2013-12-19	Christian Böhner	Vorrichtung zur Erzeugung unterschiedlicher Arbeitsdrücke
DE102012011953B4 (de) *	2012-06-18	2017-04-13	Böhner-EH GmbH	Hydraulische Vorrichtung zur Erzeugung unterschiedlicher Fördermengen mit verschiedenen Arbeitsdrücken und Verwendung solchen Vorrichtung in einem Hydrauliksystem

Also Published As

Publication number	Publication date
DE69004961D1 (de)	1994-01-13
EP0478675B1 (en)	1993-12-01
DD297942A5 (de)	1992-01-30
SE466560B (sv)	1992-03-02
EP0478675A1 (en)	1992-04-08
JPH04505790A (ja)	1992-10-08
JP2634321B2 (ja)	1997-07-23
ES2046787T3 (es)	1994-02-01
SE8902253D0 (sv)	1989-06-21
US5165862A (en)	1992-11-24
DE69004961T3 (de)	1999-06-10
DE69004961T2 (de)	1994-03-24
SE8902253L (sv)	1990-12-22
WO1990015931A1 (en)	1990-12-27
ES2046787T5 (es)	1999-05-16

Publication	Publication Date	Title
EP0478675B2 (en)	1999-02-03	A loading machine equipped with a first and a second pump supplying pressure oil to at least one hydraulically driven working component, such as a hydraulic piston-cylinder device or hydraulic motor
US9206821B2 (en)	2015-12-08	Hydraulic switching mechanism for mobile hydraulics, mobile hydraulic machine and valve unit
US3960284A (en)	1976-06-01	Hydraulic backhoe circuitry
US5642616A (en)	1997-07-01	Fluid pressure control system for hydraulic excavators
US3941514A (en)	1976-03-02	Torque limiting control
JPS63186002A (ja)	1988-08-01	少なくとも２つのアクチュエータの流体圧駆動用制御装置
KR20020071003A (ko)	2002-09-11	모빌 조종 장치
US4367624A (en)	1983-01-11	Control system for hydraulic actuator
RU2312256C2 (ru)	2007-12-10	Гидравлический блок управления и способ управления гидравлическим управляемым устройством
US4382485A (en)	1983-05-10	Hydraulic logic control for variable displacement pump
US4838756A (en)	1989-06-13	Hydraulic system for an industrial machine
US3606049A (en)	1971-09-20	Horsepower limiting hydraulic control circuit
US6293765B1 (en)	2001-09-25	Tandem fixed displacement pump with torque control
US4359130A (en)	1982-11-16	Hydraulic system for responsive splitting of engine power
US4649705A (en)	1987-03-17	Composite hydraulic system
JPS6323401B2 (sv)	1988-05-16
US5499503A (en)	1996-03-19	Hydraulic swing circuit
US4398869A (en)	1983-08-16	Control means for variable displacement pump
US8443827B2 (en)	2013-05-21	Controlling device for hydraulic consumers
CA1105360A (en)	1981-07-21	Load signal control of hydraulic motor displacement
US5634335A (en)	1997-06-03	Hydrostatic transmission with brake valve
JP2607258B2 (ja)	1997-05-07	作業機の油圧制御回路
US3679327A (en)	1972-07-25	Hydraulically regulated drive
US6938414B1 (en)	2005-09-06	Hydraulic powered arm system with float control
JP4386476B2 (ja)	2009-12-16	静水圧駆動系

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1992-02-21	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
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